Electric heater.



H. W. DENHARD.

ELECTRIC HEATER.

APPLIOATION FILED JULY 15, 1908. RENEWED NOV. 9, 1912.

Patented July 14, 1914.

2 SHEETSSHEET 1.

H. W. DENHARD.

ELECTRIC HEATER.

APPLIOA'TION IILED JULY 15, 1908. RENEWED NOV. 9, 1912.

Patented July 14, 1914.

2 SHBETSSHBET 2.

heating chamber is of rectangular form in UNITED STATES PATENT OFFICE.

HARRY W. DENI-IARD, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE CUTLER-HAMMER MFG. 00., .OF MILWAUKEE, WISCON- SIN, A CORPORATION OF WISCONSIN.

ELECTRIC HIELATEIIzt.

Specification of Letters Patent.

Application filed July 15, 1908, Serial No. 443,682. Renewed November 9, 1912. Serial No. 730,536.

To all whom it may concern:

Be it known that I, HARRY W. DENHARD, a citizen of the United States, residing at San Francisco, in the county of San Francisco, State of California, have invented cer.- tain new and useful Improvements in Electric Heaters, of which the following is a specification. I

My invention is an improvement upon an application filed by me on the 24 day of June 1908 Serial Number 440,371, in which water is heated in a chamber containing a series of positive and negative electrodes held separated from each other with the space between filled by the liquidto be heated and forming a suflicient resistance for the passage of the current to heat the liquid, the liquid passing in and'outcf the chamber from a source of supply to the poi'nt of use.

In the present 'form of my invention I have modified the construction of the electrodes as wellas'the chamber containing the electrodes so as to allow of the inlet and discharge of the water at the same end of the chamber.

In the accompanying drawing, Figure 1 shows my improved heater in elevation with part of the casing broken away to show the interior. Fig. 2 is an end view of the same, parts also being broken away. Fig. 3 is a modification showing part of the casing broken away, and Fig. 1 is an end view of Fig. 3.

The outer receptacle constituting the water Figs. 1 and 2, the walls being shown at 1, and composed of any suitable metal having an interior facing of non-corrosive material, or the whole receptacle may? be made of noncorrosive material: The receptacle is provided with a top or head 3, suitably secured to the walls, while the opposite head is also secured tojthe walls of the chamber and is provided with a central inlet passage 11 and outlet passage 10. The head 2 carries parallel electrodes 6 insulated from the head by a gasket 21 which also forms a water-tight connection between the electrodes 6 andthe ca 3 2.

The electrodes 6 extend up to near the opposite end of the chamber as shown in Fig. 1, and extend from wall to wall in their width as shown in Fig. 2. Secured to the opposite end of the chamber, that is to the cap 3,. through a metallic plate 12, is a second set of electrodes, the plate 12 being secured to, the cap by a screw 9, the screw passmgthrough an insulating bushing 8 and having a nut upon its opposite end as at 20, the screw forming also the electrical connection with an outside source of current. A gasket 5 is interposed between the plate 12 and the head 3 of the chamber. The electrodes 7 extend from wall to wall as shown in Fig. 2 and to nearly the opposite end of the chamber, these electrodes being parallel to each other and extending outside of the electrodes 6 forming a space between them. The water enters through the passage 11, passlng up between the electrodes 6 centrally of the chamber, and then around'the opposite ends of the electrodes and through the cylinder being of one diameter and the outer cylinder being of a greater diameter,- the water passing between the two cylinders and being eated in its passage.

It will be observed that the electric current will continue to flow as long as there is fluid in the channel between the electrodes, but as soon as the water is shutoff or ceases to fiow and the space between the electrodes has been drained the current will automatically cease.

What I claim is 1. An electric fluid heater comprising a casing having an opening at the lower end thereof,.a tubular electrode open at one end, and communicating at its other end with said opening, a terminal member carried. by said casing and connected with said electrode, a second tubular electrode surrounding said first electrode and spaced therefrom to provide for the flow of fluid therebetween to close the circuit across said electrodes, said second electrode bein closed at the end adjacent the open end 0 said first electrode and a second terminal member carried by said casing and supporting said second electrode by its closed end.

2. An electric fluid heater comprising a compelled to flow between said electrodes,

both said inlet and said outlet being at the lower end of said casing to ermit the latter to be drained of fluid, and t 111s open the circuit between said electrodes.

8. In an electric heater, a' casing provided with an inlet and outlet .at the same end thereof an electrode forming an openended cham er communicating w th said inlet, and a second electrode forming an openended chamber inclosing the open end of said first mentioned electrode and having its open end adjacent the outlet in the casing.

4. In, an electric heater, a casing provided with an inlet and outlet at one end thereof, an electrode fixed to one end of said casing and forming an open-ended chamber communicating with said inlet, and a second electrode fixed to the opposite end of said casing forming an open-ended chamber inclosing' the open end of said first mentioncd electrode and having its open end adjacent the outlet in the casing.

5. An electric fluid heater comprising a casing having an inlet and an outlet at one end of the same, an electrode demountably attached to one'end 'of said casing and directing the fluid toward the opposite end of said casing, and a second electrode demountably attached to the opposite end of said casing and inclosing said first mentioned electrode, said second mentioned electrode directing the fluid directly to the outlet.

6. In an electric heater, the combination of a casin having an inlet and outlet in one of its ends, a conducting plate carried by each end and insulated therefrom, electrodes fixed to each of said plates to form open ended chambers, the open end of one chamber being adjacent the closed end of the other, and terminal connections for said electrodes clamping the same in position in the heater.

7. In an electric heater, a casing having an inlet and outlet at one end of the same, conducting plates fixed to the opposite ends of said casing and insulated therefrom, terminal connections for said conducting plates,

an open ended electrode fixed to one of said plates and forming a continuation of the inlet, a second open ended electrode fixed to the opposite plate and inclosing the open end of said first mentioned electrode, the open end of said inclosing electrode being adjacent the outlet of the casing.

8. In an electric heater, the combination of a casin having an inlet and outlet, conducting F ates fixed to said casing and insulated cm the same, electric connections to said'plates, an electrode fixed to one of said plates forming an 0 en ended chamber, the closed end of which communicates with said inlet, and a second electrode fixed tothe other of said plates forming an open ended chamber surrounding the first electrode and havin its closed end ad acent the open end of the i'stmentioned chamber, and its open end adjacent the outlet of the easmg. I

In testimony whereof I have aflixed my signature in the )resence of two witnesses this-12th day of une 1908.

HARRY WV. DENI-IARD.

\Vitnesses:

FLORA M. BARTEL, A. Dixon. 

